The fastest SATA drive on the planet as of a few months ago was the
Western Digital VelociRaptor 2.5" 10,000 RPM drive in their 3.5" packaging
for good thermal dissipation.

{o.o} Just an amusing little factoid considering your comment. {^_-}
----- Original Message -----
From: "Matt Hodkinson" <ctrl@...>
Sent: Friday, 2009/July/10 02:41


> Thank you
>
> Video was the application, speed reduction would be the biggest problem
> here.
>
> We have also found out that Dell use 2 x 2.5" drives when you select
> Motherboard raid which introduces heat and reliability problems in a
> relatively small case.
>
>
> Matt
>
>
> ------------------------------
> Application?
>
> It is not ideal for video uses that stress the disk, video presentation
> using multiple raw YUV 1080i files at once with live video composited with
> some CPU based video processing. The motherboad RAID uses bus cycles
> needed
> to perform the video processing and compositing. That is the chief "speed"
> issue. (I've had a real RAID controller vastly improve performance under
> that sort of a heavy bus loading situation with a three disk RAID5. It had
> well under 1/3 the CPU bus load based on calculating it out as well as
> measurably less load on the CPU
> itself.)
>
> Anything less extreme should survive the motherboard going away and being
> replaced with a new one that had the same model raid controller on it.
>
> Backups are still a required thing, or should be, whether or not you use
> raid, especially with really large disks in the array. Incidents are
> starting to happen that a really large RAID5 with three or more disks
> cannot
> be recovered simply because of bit error rate statistics. A terabyte disk
> has some 8 to 10 terabits of information, 10^10th. That is getting into
> the
> hard bit error range for the disks when you consider what has to be done
> to
> recover a RAID5. (I'm handwaving here. The actual reports have cycled
> through Slashdot. It's a REALLY good justification to take backups -
> repeatedly.) (I tend to backup the critical stuff between RAID5s on
> separate
> machines.)
>
> {^_^}
> ------------------------------
>
>
>
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